What book about neolithic monuments in UK should I buy? Stonehenge etc..?

Hi all, it happened I moved to UK and once here I would like to see as much as possible from the neolithic history - monuments, hanging stone, Stonehenge, Avebury, you know what I mean. I would like to buy a good book to get know more - but not only for reading in the bed, it should be a walking guide a bit to help me plan some trips. Could you recommend me any? Thanks!!!